How common are RV fires?
The U.S. Fire Administration reports the top causes for RV fires are unintentional actions and failure of equipment or heat source. Very rarely is the cause an act of nature. The leading areas of the origin in RV fires were found to be the engine area, running gear, and wheel area. Other areas of origin included the cooking area and passenger area of the vehicle.
Because there can be many different sources of ignition on an RV, the NFPA requires that all RVs must have a B:C rated fire extinguisher. Portable fire extinguishers are rated by classes. These classes tell you the type of fires the extinguisher can handle. For example, Class A includes ordinary combustibles like wood, paper, plastics, etc. Class B extinguishers are intended for flammable liquids and gasses, and Class C are to be used for fires involving live electrical equipment. The other two classes, Class D and Class K are used for metals or cooking fires involving oils. The reason that the NFPA requires a Class B:C extinguisher on RVs is because of the possibility of an engine fire, propane spill, or gas spill. These are flammable liquids that are commonly handled in and around an RV.